Walking Neural Networks In Blender?
You should be able to use neural networks in Blender for instance with Tensorflow and Keras. There are several problems though, while Blender has several ways to simulate physics, it does not have muscle simulation. The interaction between neural network an physics may be very complicated. Adjusting the state based on the output of the neural network will require different adjustments to depending on the physics sim. For some there may not even be a way to adjust parameters mid-way. Interactive display and performance will require that the NN is run in a different process so the UI isn't locked. 

It may be technically possible, but as of now this would require extensive work and likely modification of Blender's source.